JP6978296B2 - Manufacturing method of heat-insulated double container - Google Patents

Description

The present invention relates to a heat insulating double container such as a double-structured mug, a soup cup, a lunch jar, a portable thermos bottle, and a tabletop thermos bottle, and a method for manufacturing the same.

Conventionally, the structure of the vacuum double container of Patent Document 1 is known as the structure of the heat insulating double container. In this vacuum double container, an inwardly folded folded portion is formed at the mouth of the outer container, a diameter-expanded portion is formed at the mouth of the inner container, and the tip of the folded portion of the outer container is the root of the enlarged diameter portion. The folded portion of the outer container is fitted inside the enlarged diameter portion of the inner container to a position where the folded portion of the outer container is substantially in contact with the container, and the tip of the folded portion of the outer container is welded and fixed to the inner surface of the inner container.

When manufacturing the vacuum double container of Patent Document 1, the inner container is inserted inside the mouth of the outer container, and the mouth of the outer container is located at the base of the enlarged diameter portion formed at the mouth of the inner container. The folded portion of the mouth portion of the outer container is fitted inside the enlarged diameter portion of the inner container until the tip of the folded portion of the inner container is substantially in contact with the folded portion. Further, in this fitted state, the tip of the folded portion of the mouth of the outer container is fixed by welding the inner surface of the inner container by laser welding. After that, the body and bottom of the outer container are welded to the mouth of the outer container, and a vacuum suction / exhaust process is performed on the space between the inner container and the outer container to obtain a vacuum double container (Patent Document). 1 to FIGS. 1 to 6 and paragraphs [0008] to [0011] and [0016] to [0025]).

In this vacuum double container, the folded part of the outer container and the mouth of the inner container are welded and fixed inside the mouth of the outer container, so when drinking a beverage directly from the container, the welded part drinks. It doesn't hit my mouth. Therefore, even if a resin inner plug member or the like is not separately provided in the mouth portion, the drinker can obtain a good drinking comfort and the safety of the drinker can be enhanced. Further, by fitting the folded portion of the outer container to the inside of the enlarged diameter portion of the inner container until the tip substantially abuts, the outer container and the inner container can be easily positioned at an accurate position (patented). (See paragraphs [0008] and [0009] of Document 1).

Japanese Unexamined Patent Publication No. 2014-110

However, in the vacuum double container of Patent Document 1, in order to fit the inner container inside the outer container, the mouth portion of the outer container and the body portion of the outer container are used as separate members, and the mouth portion is formed on the peripheral side surface of the outer container. Since the body is welded to the body, welding marks are formed on the peripheral side surface of the outer container. Since the peripheral side surface of the outer container is a conspicuous place that easily attracts the eyes of consumers, the design and aesthetics of the container are impaired. Therefore, there is a demand for a heat-insulated double container that can obtain a higher degree of design and excellent aesthetics.

The present invention has been proposed in view of the above problems, and is a heat insulating double that can easily position the outer container and the inner container at accurate positions, and can obtain a higher design and an excellent aesthetic appearance. It is an object of the present invention to provide a container and a method for manufacturing the same.

In the heat insulating double container of the present invention, a heat insulating layer is provided between a substantially bottomed tubular and metal inner container and a substantially bottomed tubular and metal outer container, and the inside of the mouth of the outer container is provided with a heat insulating layer. A folded portion is formed, and a diameter-expanded portion is formed at the mouth of the inner container, and the folded portion is brought to a position where the tip of the folded portion substantially abuts on the root of the expanded portion. A heat-insulating double container fitted inside the enlarged diameter portion and having the tip of the folded portion welded and fixed to the inner surface of the inner container, at least from the mouth of the outer container to the body of the outer container. It is characterized in that it is composed of a single member over the portion, and the peripheral side surface from the mouth side end portion to the bottom side end portion of the outer container is a non-welded surface.
According to this, the outer container and the inner container can be easily positioned at an accurate position by fitting the folded portion of the outer container to the position where the tip substantially abuts on the inside of the enlarged diameter portion of the inner container. .. Furthermore, it is also possible to suppress and fix the steps generated on these inner surfaces, such as making the inner surface of the folded portion of the outer container and the inner surface closer to the bottom than the enlarged diameter portion of the inner container substantially flush with each other. It is also possible to improve the aesthetics of. In addition, since it is not necessary to separately install a resin inner plug member in the mouth, the structure of the container is simplified, the efficiency of the manufacturing process is improved, the manufacturing cost is reduced, the number of parts is increased, and the weight of the container is increased. You can also get the advantage of preventing. In addition, since the peripheral side surface from the mouth side end to the bottom side end of the outer container is a non-welded surface, there are no welding marks on the peripheral side surface of the outer container, which is easily noticeable to consumers, and the design is more advanced. It is possible to obtain a heat-insulated double container with good quality and excellent appearance.

In the heat insulating double container of the present invention, the folded portion of the folded portion has the peripheral wall of the enlarged diameter portion urged outward and the peripheral wall of the enlarged diameter portion urges the folded portion inward. The tip is welded to the inner surface of the inner container.
According to this, it is possible to improve the adhesion and contactability between the folded portion and the peripheral wall of the enlarged diameter portion. Therefore, the integrated strength of the outer container and the inner container can be further increased, and welding such as laser welding of the outer container and the inner container can be performed more reliably.

The heat-insulated double container of the present invention is characterized by being a beverage container.
According to this, when the beverage is drunk directly from the container, the welded portion does not hit the drinker's mouth. Therefore, even if a resin inner plug member or the like is not separately provided in the mouth portion, the drinker can obtain a good drinking comfort and the safety of the drinker can be enhanced. In addition, since it is possible to suppress and fix the step generated between the inner surface of the folded portion of the outer container and the inner surface closer to the bottom than the enlarged diameter portion of the inner container, it is possible to secure the smooth fluidity of the beverage discharged from the container. Can also be planned.

The heat-insulating double container of the present invention is characterized in that the entire outer container is composed of a single member.
According to this, since the outer container can be made into an outer container without welding marks as a whole, the design and aesthetics of the heat insulating double container can be further enhanced. Further, since the outer container can be formed only by deforming a single member, it is possible to reduce the manufacturing cost and improve the manufacturing efficiency.

The method for manufacturing a heat-insulated double container of the present invention is a method for manufacturing a heat-insulated double container of the present invention, and is an outer container configuration constituting at least a portion extending from the mouth of the outer container to the body of the outer container. The inner container is inserted into the member from the mouth side, and the folded portion formed by folding inward at the corresponding portion of the mouth portion of the outer container in the outer container constituent member is formed in the mouth portion of the inner container. The first step of press-fitting the inner container into the outer container constituent member while urging outward with the portion, and the inner container being inserted into the outer container constituent member until the enlarged diameter portion gets over the folded portion. The second step of springing back the folded portion inward and the peripheral wall of the enlarged diameter portion outward, and the folding back until the tip of the folded portion substantially abuts on the base of the expanded diameter portion by the return operation. It is characterized by comprising a third step of fitting the portion inside the enlarged diameter portion.
According to this, by fitting the folded portion inside the enlarged diameter portion by the return operation, the folded portion urges the peripheral wall of the enlarged diameter portion outward and the peripheral wall of the enlarged diameter portion inwardly inserts the folded portion. It is possible to surely fit the folded portion and the peripheral wall of the enlarged diameter portion in a state of being urged to the surface, and to surely improve the adhesion and contact. Therefore, the integrated strength of the outer container and the inner container can be further increased, and welding such as laser welding of the outer container and the inner container can be performed more reliably. Further, since the contact area between the folded portion and the enlarged diameter portion is expanded, the allowable range of the welding position such as laser welding is widened, the welding work can be facilitated, the defective welding products can be reduced, and the yield can be improved.

In the method for manufacturing a heat-insulated double container of the present invention, in the third step, the inner container jig is held by the inner container jig from the inside so as not to be movable in the axial direction, and the inner container jig is held toward the folded portion. It is characterized in that the return operation is performed by retreating to.
According to this, by performing the inner container jig retract the inner container jig while holding the inside so as not to move in the axial direction of the inner container with the return operation, the bottom of the outer container structure member closed , The process of return operation can be performed regardless of the open state. Therefore, the range of heat-insulated double containers to which the manufacturing process of the present invention can be applied can be diversified.

According to the present invention, the outer container and the inner container can be easily positioned at accurate positions, and a heat-insulated double container that realizes a higher degree of design and excellent aesthetics can be obtained.

The front view which shows the heat insulation double container of 1st Embodiment by this invention. The vertical sectional view which shows the heat insulation double container of 1st Embodiment. A partially enlarged cross-sectional view showing the periphery of the folded-back portion and the enlarged diameter portion in the heat-insulated double container of the first embodiment. It is explanatory drawing which shows the state which press-fits the inner container while urging the folded part outward by the diameter-expanding part in the manufacturing process of the heat-insulating double container of 1st Embodiment. The explanatory view which shows the state which the inner container was inserted until the diameter-expanded part got over the folded part in the manufacturing process of the heat insulating double container of 1st Embodiment. The explanatory view which shows the state which the folded-back part was fitted in the inside of the diameter-expanded part by the return operation in the manufacturing process of the heat-insulating double container of 1st Embodiment. The vertical sectional view which shows the heat insulation double container of 2nd Embodiment by this invention. A partially enlarged cross-sectional view showing the periphery of the folded-back portion and the enlarged diameter portion in the heat-insulated double container of the second embodiment.

[Insulated double container of the first embodiment and its manufacturing method]
The heat-insulating double container 1 of the first embodiment according to the present invention is used as a mug or the like, and as shown in FIGS. 1 to 3, it has a substantially bottomed cylindrical shape and a metal inner container 2 and a substantially bottomed bottom. It has a tubular and metal outer container 3, and a space is provided between the inner container 2 and the outer container 3, and this space is the heat insulating layer 4. The heat insulating layer 4 in the present embodiment is a vacuum heat insulating layer in which the space between the inner container 2 and the outer container 3 is in a vacuum state or a reduced pressure state, but the space between the inner container 2 and the outer container 3 is large. A vacuum heat insulating layer made of a vacuum heat insulating material is provided by applying a metal foil such as copper or aluminum to the heat insulating layer of the air layer in a state of atmospheric pressure, or the outer surface of the inner container 2 and the inner surface of the outer container 3. Is also possible.

The inner container 2 is composed of a mouth portion 21 on the opening side, a tubular body portion 22, and a bottom portion 23. A diameter-expanded portion 24 is formed in the mouth portion 21 of the inner container 2 so as to expand outward, and the diameter-expanded portion 24 is provided in a circumferential shape so as to form an opening edge of the inner container 2. The enlarged diameter portion 24 has a root 241 that extends outward and a peripheral wall 242 that extends from the tip of the root 241 to the mouth side. The inner container 2 is formed of a thin-walled material having substantially the same thickness as a whole, and the inner container 2 of the present embodiment is formed by, for example, pressing a thin-walled plate material which is a single member. If the inner container 2 is composed of a single member, the inner container 2 can be formed only by deforming the single member, which is preferable because the manufacturing cost can be reduced and the manufacturing efficiency can be improved. However, it is also possible to form the inner container 2 by joining a plurality of members such as a member constituting the mouth portion and a member constituting the body portion and the bottom portion by welding or the like.

The outer container 3 is composed of a mouth portion 31 on the opening side, a tubular body portion 32, and a bottom plate 33. The mouth portion 31 of the outer container 3 is folded inward to form a folded portion 34, and the folded portion 34 is provided in a circumferential shape so as to form an opening edge of the outer container 3. The folded portion 34 in the present embodiment includes a curved portion 341 provided at the tip of the mouth portion 31, a tapered portion 342 inclined inward from the inner end of the curved portion 341 toward the bottom side, and an inner end of the tapered portion 342. It has an extension 343 that extends substantially vertically from the bottom to the bottom.

The body portion 32 of the outer container 3 is formed in a row from the mouth portion 31, and is bent inward on the bottom side, and the bent portion 321 constitutes a part of the bottom portion of the outer container 3. A step portion 322 is formed on the bottom side of the body portion 32 so as to be recessed from the bent portion 321 toward the mouth side, and an opening 323 is formed on the bottom side of the body portion 32 so that the tip of the step portion 322 is the peripheral edge. ing. The mouth portion 31 and the body portion 32 of the outer container 3 are formed of a thin material having substantially the same thickness as a single member, and are composed of a single member from the mouth portion 31 of the outer container 3 to the body portion 32. There is. That is, the peripheral side surface 35 composed of the mouth portion 31 and the body portion 32 from the mouth side end portion to the bottom side end portion of the outer container 3 is a non-welded surface having no welding marks as a whole. Further, the outer container 3 is formed by, for example, pressing a thin-walled tubular material which is a single member.

The bottom plate 33 of the outer container 3 is composed of a member different from the members of the mouth portion 31 and the body portion 32, is arranged so as to close the opening 323 on the bottom side of the body portion 32, and is welded to the step portion 322. Is fixed. The bottom plate 33 is provided with a suction hole 331 used for exhausting by vacuum suction from the space between the inner container 2 and the outer container 3, and the suction hole 331 is sealed on the inner surface side of the bottom plate 33. Later, a getter 332 is provided to absorb the gas in the space between the inner container 2 and the outer container 3.

The folded-back portion 34 of the outer container 3 is fitted inside the enlarged-diameter portion 24 of the inner container 2 until the tip of the folded-back portion 34 substantially abuts on the root 241 of the enlarged-diameter portion 24. The tip of the folded portion 34 of the outer container 3 is welded and fixed to the inner surface of the inner container 2 at a position near the root 241 of the enlarged diameter portion 24, and the tip of the folded portion 34 is fixed to the root of the enlarged diameter portion 24. A welded portion 5 is formed along the circumferential direction at a portion substantially in contact with 241. In the present embodiment, the tip of the folded portion 34 of the outer container 3 is fixed to the inner surface of the inner container 2 by welding by laser welding. By this laser welding, the outer container 3 can be welded and fixed to the inner container 2 with precise low strain, the residual stress of the heat insulating double container 1 can be reduced, and the deformation at the time of welding can be prevented.

Further, the folded portion 34 of the outer container 3 urges the peripheral wall 242 of the enlarged diameter portion 24 of the inner container 2 outward, and the peripheral wall 242 of the enlarged diameter portion 24 of the inner container 2 inside the folded portion 34 of the outer container 3. The tip of the folded-back portion 34 is welded to the inner surface of the inner container 2 in a state of being urged toward the side. In the present embodiment, the extending portion 343 and the tapered portion 342 or the extending portion 343 of the folded-back portion 34 press the peripheral wall 242 of the enlarged diameter portion 24 outward to urge the peripheral portion 24, and the peripheral wall 242 of the enlarged diameter portion 24 is urged. The tip of the folded-back portion 34 is fixed to the inner surface of the inner container 2 by the welded portion 5 by laser welding while the extended portion 343 and the tapered portion 342 or the extended portion 343 of the folded-back portion 34 are pressed against the contents and urged. ing.

When manufacturing the heat-insulating double container 1 of the first embodiment, for example, a thin flat plate-shaped plate is pressed to form an inner container 2 having a predetermined shape having a diameter-expanded portion 24 that expands outward. At the same time, the thin-walled tubular material is pressed or the like to form an outer container constituent member 3 m having a predetermined shape and having a folded portion 34 bent inward and folded back. The outer container constituent member 3m constitutes a portion extending from the mouth portion 31 to the body portion 32 of the outer container 3. When forming the folded-back portion 34, the tip of the thin-walled tubular material is bent inward and curled to form an inwardly curved foundation folded-back portion, and then the vicinity of the tip of the foundation folded-back portion is formed. When the folded portion 34 is cut to form the folded portion 34, it is possible to form the folded portion 34 having a thin and stable diameter without wrinkles, and the same applies to the second embodiment described later.

Next, as shown in FIG. 4, the outer container constituent member 3 m is held by the outer container jig 11, and the inner container 2 is held by the inner container jig 12. The outer container jig 11 in the illustrated example is configured to hold the outer container constituent member 3 m so as to cover the outer container constituent member 3 m from the peripheral side surface 35 of the body portion 32 to the bent portion 321 on the bottom side. .. Further, the inner container jig 12 is configured to hold the inner container 2 from the inside. The inner container jig 12 in the illustrated example is a suction pad that sucks the bottom 23 of the inner container 2 under reduced pressure and holds it from the inside. For example, a plurality of pieces are radially opened to hold the body 22 of the inner container 2. It is also possible to use a jig or the like that presses from the inside to the outside and holds the inner container 2 from the inside with a plurality of open frames.

Then, the inner container jig 12 that holds the inner container 2 with respect to the outer container constituent member 3 m constituting the portion extending from the mouth portion 31 to the body portion 32 of the outer container 3 positioned at a predetermined position by the outer container jig 11. Is advanced in the axial direction of the outer container constituent member 3 m, the inner container 2 is inserted from the mouth side of the outer container constituent member 3 m, and further, as shown by the thick line arrow F1 in FIG. 4, the outer container in the outer container constituent member 3 m is inserted. The folded-back portion 34 formed by folding back inward at the corresponding portion of the mouth portion 31 of 3 is urged outward by the enlarged diameter portion 24 formed in the mouth portion 21 of the inner container 2 to form the outer container constituent member 3 m. The inner container 2 is press-fitted. During this press-fitting operation, the folded-back portion 34 is pressed outward by the enlarged diameter portion 24 to bend and deform so as to approach the peripheral side surface 35, and the peripheral wall 242 of the enlarged-diameter portion 24 is pressed inward by the folded-out portion 34. Transforms so that it bends inward.

After that, as shown by the thick line arrow F2 in FIG. 5, the inner container jig 12 is further advanced in the axial direction of the outer container constituent member 3 m, and becomes the outer container constituent member 3 m until the diameter-expanded portion 24 gets over the folded portion 34. The inner container 2 is inserted. When the enlarged diameter portion 24 gets over the folded-back portion 34, the folded-back portion 34 that has been deformed outward by the press-fitting operation is elastically recovered inward to some extent by the springback and deformed, and at the same time, it is deformed inward by the press-fitting operation. The peripheral wall 242 of the enlarged diameter portion 24 has been elastically restored to some extent by springback and deformed.

Next, the inner container jig 12 that holds the inner container 2 such as a suction pad in an axial direction is retracted to retract the inner container 2, or the bottom 23 of the inner container 2 is pressed toward the mouth to retract the inner container 2. By inserting the pressing tool into the inside of the outer container constituent member 3 m from the opening 323 of the outer container constituent member 3 m and retracting the inner container 2, the inner container 2 is retracted by the return operation as shown by the thick line arrow B in FIG. The folded portion 34 is fitted inside the enlarged diameter portion 24 until the tip of the folded portion 34 or the tip of the extended portion 343 substantially abuts on the root 241 of the enlarged diameter portion 24. In this case, where possible inner container jig 12 holding the inner immovably the container 2, such as suction pads axially inner container jig 12 while holding the container 2 from the inside so as not to move in the axial direction When the return operation is performed by retracting the container, the return operation process can be performed regardless of whether the bottom side of the outer container component 3 m is closed or open, and the range of the heat-insulated double container to which this manufacturing process can be applied. Can be diversified and is suitable.

The operation of inserting and press-fitting the inner container 2 from the mouth side into the outer container constituent member 3 m and the return operation of the inner container 2 by retracting the inner container 2 to the mouth side of the outer container constituent member 3 m is the inner container of the above manufacturing process example. The step is not limited to the step of moving 2, and it is possible to appropriately move the outer container constituent member 3 m and the inner container 2 relative to each other. For example, the outer container constituent member 3 m, such as a jig in which the inner container 2 is positioned at a predetermined position by the inner container jig 12 and is covered and held over the bent portion 321 of the outer container constituent member 3 m, the peripheral side surface 35, and the curved portion 341. Using the outer container jig 11 that can hold the outer container non-movably in the axial direction, the outer container jig 11 that holds the outer container component 3 m immovably in the axial direction is moved from the bottom side to the mouth side of the inner container 2. The inner container 2 is inserted and press-fitted, and the outer container jig 11 holding the outer container component 3 m immovably in the axial direction is moved from the mouth side to the bottom side of the inner container 2 to move the inner container 2. It is also possible to perform a return operation by the relative retreat of.

Then, in this fitted state, the tip of the folded portion 34 of the outer container 3 is fixed by laser welding to the inner surface of the inner container 2 at a position near the root 241 of the enlarged diameter portion 24. Further, a bottom plate 33 is arranged so as to close the opening 323 of the outer container constituent member 3 m, and is welded and fixed to the step portion 322 to form the outer container 3 and between the inner container 2 and the outer container 3. The heat-insulated double container 1 of the first embodiment is obtained by performing necessary steps such as vacuum suction and exhaust from the suction hole 331 for the space.

According to the first embodiment, the outer container 3 and the inner container 2 are accurately fitted by fitting the folded portion 34 of the outer container 3 to a position where the tip substantially abuts on the inside of the enlarged diameter portion 24 of the inner container 2. It can be easily positioned in position. Further, it is also possible to suppress and fix the step generated on these inner surfaces, such as making the inner surface of the folded portion 34 of the outer container 3 substantially flush with the inner surface closer to the bottom than the enlarged diameter portion 24 of the inner container 2. It is also possible to improve the aesthetics of the inside of the container. In addition, since it is not necessary to separately install a resin inner plug member in the mouth, the structure of the container is simplified, the efficiency of the manufacturing process is improved, the manufacturing cost is reduced, the number of parts is increased, and the weight of the container is increased. You can also get the advantage of preventing. Further, since the peripheral side surface 35 from the mouth side end portion to the bottom side end portion of the outer container 3 is a non-welded surface, there are no welding marks on the peripheral side surface 35 of the outer container 3 which is conspicuous and easily attracts the eyes of consumers. It is possible to obtain a heat insulating double container 1 having a higher degree of design and an excellent appearance.

Further, the folded portion 34 of the outer container 3 urges the peripheral wall 242 of the enlarged diameter portion 24 of the inner container 2 outward, and the peripheral wall 242 of the enlarged diameter portion 24 of the inner container 2 inside the folded portion 34 of the outer container 3. By welding the tip of the folded-back portion 34 to the inner surface of the inner container 2 in a state of being urged toward the side, the adhesion and contact between the folded-back portion 34 and the peripheral wall 242 of the enlarged diameter portion 2 can be improved. Therefore, the integrated strength of the outer container 3 and the inner container 2 can be further increased, and welding such as laser welding of the outer container 3 and the inner container 2 can be performed more reliably.

Further, when the heat insulating double container 1 is used as a beverage container in which a contained beverage such as a mug, a soup cup, or a portable thermos can be directly drunk, the welded portion is the mouth of a person who drinks the beverage directly from the container. Never hit. Therefore, even if a resin inner plug member or the like is not separately provided in the mouth portion, the drinker can obtain a good drinking comfort and the safety of the drinker can be enhanced. Further, since it is possible to suppress and fix the step generated between the inner surface of the folded portion 34 of the outer container 3 and the inner surface closer to the bottom than the enlarged diameter portion 24 of the inner container 2, it is possible to fix the beverage smoothly out of the container. It is also possible to secure liquidity.

Further, the folded portion is manufactured by manufacturing the heat insulating double container 1 by using the manufacturing process in which the inner container 2 is press-fitted, springed back, and the folded portion 34 is fitted to the inside of the enlarged diameter portion 24 by the return operation. 34 urges the peripheral wall 242 of the enlarged diameter portion 24 outward, and the peripheral wall 242 of the enlarged diameter portion 24 securely fits the folded portion 34 inwardly, and the folded portion 34 and the enlarged diameter portion are securely fitted. Adhesion and contact with the peripheral wall 242 of 24 can be surely improved. Further, as a result, the contact area between the folded-back portion 34 and the enlarged diameter portion 24 is expanded, so that the allowable range of the welding position such as laser welding is widened, the welding work is facilitated, the defective welding products are reduced, and the yield is improved. be able to.

[Insulated double container of the second embodiment and its manufacturing method]
The heat-insulating double container 1a of the second embodiment according to the present invention is used as a mug or the like, and as shown in FIGS. 7 and 8, it has a substantially bottomed cylindrical and metal inner container 2 and a substantially bottomed bottom. It has a tubular and metal outer container 3a, and a space is provided between the inner container 2 and the outer container 3a, and this space serves as a heat insulating layer 4a. The heat insulating layer 4a in the present embodiment is a heat insulating layer of an air layer in which the space between the inner container 2 and the outer container 3a is in a state of atmospheric pressure. The configuration of the inner container 2 in the heat-insulated double container 1a of the second embodiment is the same as the configuration of the inner container 2 in the heat-insulated double container 1 of the first embodiment.

The outer container 3a is composed of a mouth portion 31a on the opening side, a tubular body portion 32a, and a bottom portion 33a. The mouth portion 31a of the outer container 3a is folded inward to form a folded portion 34a, and the folded portion 34a is provided in a circumferential shape so as to form an opening edge of the outer container 3a. Similar to the folded portion 34 of the first embodiment, the folded portion 34a in the second embodiment also has the curved portion 341a provided at the tip of the mouth portion 31a and the inside of the curved portion 341a from the inner end toward the bottom side. It has a tapered portion 342a that is inclined toward the bottom and an extending portion 343a that extends substantially vertically from the inner end of the tapered portion 342a toward the bottom side.

The mouth portion 31a, the body portion 32a, and the bottom portion 33a of the outer container 3a are formed of a thin material having substantially the same thickness as a single member, and simply extend over the mouth portion 31a, the body portion 32a, and the bottom portion 33a of the outer container 3a. It is composed of one member. That is, the peripheral side surface 35a composed of the mouth portion 31a and the body portion 32a from the mouth side end portion to the bottom side end portion of the outer container 3a is a non-welded surface having no welding marks as a whole. Further, the outer container 3a is formed by, for example, pressing a thin plate material which is a single member.

The folded-back portion 34a of the outer container 3a is fitted inside the enlarged-diameter portion 24 of the inner container 2 to a position where the tip of the folded-back portion 34a substantially abuts on the root 241 of the enlarged-diameter portion 24. The tip of the folded portion 34a of the outer container 3a is fixed by welding to the inner surface of the inner container 2 at a position near the root 241 of the enlarged diameter portion 24, and the tip of the folded portion 34a is the root of the enlarged diameter portion 24. A welded portion 5 is formed along the circumferential direction at a portion substantially in contact with 241. Also in the second embodiment, the tip of the folded portion 34a of the outer container 3a is fixed to the inner surface of the inner container 2 by welding by laser welding, and the outer container 3a is welded and fixed to the inner container 2 with precise low distortion to insulate. The residual stress of the double container 1a is reduced and deformation during welding is prevented.

Further, the folded portion 34a of the outer container 3a urges the peripheral wall 242 of the enlarged diameter portion 24 of the inner container 2 outward, and the peripheral wall 242 of the enlarged diameter portion 24 of the inner container 2 inside the folded portion 34a of the outer container 3a. The tip of the folded-back portion 34a is welded to the inner surface of the inner container 2 in a state of being urged toward the side. Also in the second embodiment, the extending portion 343a and the tapered portion 342a or the extending portion 343a of the folded-back portion 34a press the peripheral wall 242 of the enlarged diameter portion 24 outward to urge the peripheral portion 24, and the peripheral wall 242 of the enlarged diameter portion 24 is also urged. Is urged by pressing the extended portion 343a and the tapered portion 342a or the extended portion 343a of the folded portion 34a against the contents, and the tip of the folded portion 34a is fixed to the inner surface of the inner container 2 by the welded portion 5 by laser welding. Has been done.

When manufacturing the heat-insulating double container 1a of the second embodiment, for example, a thin flat plate-shaped plate is pressed to form an inner container 2 having a predetermined shape having a diameter-expanded portion 24 that expands outward. At the same time, a thin flat plate is subjected to press working or the like to form an outer container 3a having a predetermined shape having a folded portion 34a that is bent inward and folded back. That is, the outer container constituent member constituting at least the portion extending from the mouth portion 31a to the body portion 32a of the outer container 3a in the second embodiment constitutes a portion extending over the mouth portion 31a, the body portion 32a, and the bottom portion 33a of the outer container 3a. It is an outer container 3a.

Next, the outer container 3a and the inner container 2 are held by the outer container jig 11 and the inner container jig 12 as in the manufacturing process of the first embodiment, respectively. As the inner container jig 12 in the second embodiment, a jig such as a suction pad that can hold the inner container 2 so as not to be movable in the axial direction from the inside is used. Then, in the same step as in the first embodiment, the inner container 2 is inserted into the outer container 3a from the mouth side, and the folded portion 34a formed by folding back inward into the mouth portion 31a of the outer container 3a is formed into the mouth of the inner container 2. The inner container 2 is press-fitted into the outer container 3a while being urged outward by the enlarged diameter portion 24 formed in the portion 21. During this press-fitting operation, the folded portion 34a is pressed outward by the enlarged diameter portion 24 and bends and deforms so as to approach the peripheral side surface 35a of the outer container 3a, and the peripheral wall 242 of the enlarged diameter portion 24 is inside the folded portion 34a. It is pressed toward you and deforms so that it bends inward (see FIG. 4).

Then, as in the first embodiment, the inner container 2 is inserted into the outer container 3a until the diameter-expanded portion 24 gets over the folded-back portion 34a. When the enlarged diameter portion 24 gets over the folded-back portion 34a, the folded-back portion 34a, which has been deformed outward by the press-fitting operation, elastically recovers inward to some extent by the springback and deforms, and at the same time, deforms inward by the press-fitting operation. The peripheral wall 242 of the enlarged diameter portion 24 has been elastically restored to some extent by springback and deformed (see FIG. 5).

Next, as in the first embodiment, the inner container 2 is retracted by the return operation, and the folded portion 34a is expanded until the tip of the folded portion 34a or the tip of the extending portion 343a substantially abuts on the root 241 of the enlarged diameter portion 24. Fits inside the diameter portion 24. In this case, where possible inner container jig 12 holding the inner immovably the container 2, such as suction pads axially inner container jig 12 while holding the container 2 from the inside so as not to move in the axial direction Is retracted to perform a return operation, and the return operation step is performed by adapting to the outer container 3a whose bottom side is closed (see FIG. 6). The operation of inserting and press-fitting the inner container 2 into the outer container 3a from the mouth side and returning the inner container 2 to the mouth side of the outer container 3a by retracting the inner container 3a is the same as in the first embodiment. It can be appropriately performed by the relative movement of the inner container 2 and the inner container 2.

Then, in this fitted state, the tip of the folded portion 34a of the outer container 3a is fixed by laser welding to the inner surface of the inner container 2 at a position near the root 241 of the enlarged diameter portion 24, and the second embodiment is performed. Insulated double container 1a is obtained.

According to the second embodiment, the corresponding effect can be obtained from the configuration corresponding to the first embodiment. Further, since the outer container 3a having no welding marks can be formed as a whole, the design and aesthetics of the heat insulating double container 1a can be further enhanced. Further, since the outer container 3a can be formed only by deforming a single member, it is possible to reduce the manufacturing cost and improve the manufacturing efficiency.

[Scope of inclusion of the invention disclosed herein]
In addition to the inventions listed as inventions, the embodiments thereof, and variations thereof, the invention disclosed in the present specification changes these partial contents to other contents disclosed in the present specification to the extent applicable. Specified by adding other contents disclosed in the present specification to these contents, or these partial contents are deleted to the extent that partial action and effect can be obtained and made into a higher concept. Includes those identified in the above. The invention disclosed in the present specification also includes the following modifications and additional contents.

For example, the shape of the heat-insulated double container of the present invention is not limited to the shapes of the first and second embodiments and is appropriate, and the heat-insulated double container of the present invention is for beverages such as mugs, soup cups, and portable thermos bottles. Although it is suitable as a container, it can be applied to an appropriate heat-insulated double container such as a lunch jar or a tabletop thermos bottle. Further, the shape of the folded portion in the present invention is not limited to the first and second embodiments, and is appropriate within the scope of the gist of the present invention. It is also possible to make a folded part or the like consisting of only a part and an extension part.

The present invention can be used for a heat insulating double container such as a double-structured mug, a soup cup, a lunch jar, a portable thermos bottle, and a tabletop thermos bottle.

1, 1a ... Insulated double container 2 ... Inner container 21 ... Mouth 22 ... Body 23 ... Bottom 24 ... Diameter 241 ... Root 242 ... Peripheral wall 3, 3a ... Outer container 31, 31a ... Mouth 32, 32a ... Body part 321 ... Bending part 322 ... Step part 323 ... Opening 33 ... Bottom plate 33a ... Bottom part 331 ... Suction hole 332 ... Getter 34, 34a ... Folded part 341, 341a ... Curved part 342, 342a ... Tapered part 343, 343a ... Extension Parts 35, 35a ... Peripheral side surface 3m ... Outer container component 4, 4a ... Insulation layer 5 ... Welded part 11 ... Outer container jig 12 ... Inner container jig

Claims (2)

A heat insulating layer is provided between the substantially bottomed tubular and metal inner container and the substantially bottomed tubular and metal outer container, and an inwardly folded folded portion is formed at the mouth of the outer container. At the same time, a diameter-expanded portion is formed at the mouth of the inner container, and the folded-back portion is fitted inside the expanded-diameter portion to a position where the tip of the folded-back portion substantially abuts on the root of the expanded-diameter portion. , the tip of the folded portion is fixed by welding to the inner surface of the inner container, is composed of a single member over at least a mouth portion of said outer container body of the outer container, the mouth of the outer container A method for manufacturing a heat-insulated double container in which the peripheral side surface from the side end to the bottom end is a non-welded surface.
The inner container is inserted from the mouth side into the outer container constituent member constituting at least the portion extending from the mouth portion of the outer container to the body portion of the outer container, and the corresponding portion of the mouth portion of the outer container in the outer container constituent member is inserted. The first step of press-fitting the inner container into the outer container constituent member while urging the folded portion formed by folding inward to the outside by the enlarged diameter portion formed at the mouth of the inner container.
The second step is to insert the inner container into the outer container component until the enlarged diameter portion gets over the folded portion, and spring back the folded portion inward and the peripheral wall of the enlarged diameter portion outward. ,
Manufacture of a heat-insulated double container comprising a third step of fitting the folded-back portion inside the enlarged-diameter portion until the tip of the folded-back portion substantially abuts on the root of the enlarged-diameter portion by a return operation. Method. The third step is characterized in that the inner container jig is retracted toward the folded portion while the inner container is held from the inside so as not to be movable in the axial direction, and the return operation is performed. The method for manufacturing a heat-insulated double container according to claim 1.

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